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Which of the following movement is not related to auxin level?

1. Bending of shoot towards light
2. Movement of root towards soil
3. Nyctinastic leaf movements
4. Movement of sunflower head tracking the sun

Correct answer: Nyctinastic leaf movements

Solution

Nyctinastic leaf movements are sleep movements driven by circadian rhythms and changes in turgor, not by auxin distribution. The other options are tropic responses where unequal auxin levels help direct growth.

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